Mistress Sidonia, born Sidonia von Borek in 1550, was a noblewoman from Moravia, a region in what is now the Czech Republic. She was a member of the von Borek family, a prominent noble family in Moravia. Sidonia's life took a dramatic turn when she was appointed as a lady-in-waiting to Emperor Rudolf II's sister, Archduchess Elisabeth of Austria, at the royal court in Prague.
Sidonia von Borek, Sidonia von Borck
1550, Roštín, Moravia (now part of the Czech Republic)










